Sharp R-555 Service Manual ▷ View online
R-555(SL)
15
30
XIN
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XIN terminal.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XIN terminal.
31
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
Output to control oscillation input of XOUT.
32
VSS
IN
Power source voltage: -5.0V.
VC voltage of power source circuit input.
VC voltage of power source circuit input.
33
P27
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G8 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G8 line keys on key matrix is touched.
34
P26
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G7 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G7 line keys on key matrix is touched.
35
P25
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN2, P41, P43, P44 and P45
terminal while one of G6 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to AN2, P41, P43, P44 and P45
terminal while one of G6 line keys on key matrix is touched.
36
P24
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G5 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G5 line keys on key matrix is touched.
37
P23
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G4 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G4 line keys on key matrix is touched.
38
P22
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G3 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G3 line keys on key matrix is touched.
39
P21
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G2 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G2 line keys on key matrix is touched.
40
P20
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G1 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45
terminal while one of G1 line keys on key matrix is touched.
41-48
P17-P10
OUT
Terminal not used.
49-50
P07-P06
OUT
Terminal not used.
51-72
SEG21-SEG0
OUT
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
LCD (Pin No.)
LSI signal (Pin No.)
LCD (Pin No.)
SEG 21 (51) ....................... SEG 3 (23)
SEG 10 (62) ....................... SEG 14 (12)
SEG 20 (52) ....................... SEG 2 (24)
SEG 9 (63) ....................... SEG 13 (13)
SEG 19 (53) ....................... SEG 1 (25)
SEG 8 (64) ....................... SEG 12 (14)
SEG 18 (54) ...................... SEG 22 ( 4)
SEG 7 (65) ....................... SEG 11 (15)
SEG 17 (55) ...................... SEG 21 ( 5)
SEG 6 (66) ....................... SEG 10 (16)
SEG 16 (56) ...................... SEG 20 ( 6)
SEG 5 (67) ........................ SEG 9 (17)
SEG 15 (57) ...................... SEG 19 ( 7)
SEG 4 (68) ........................ SEG 8 (18)
SEG 14 (58) ...................... SEG 18 ( 8)
SEG 3 (69) ........................ SEG 7 (19)
SEG 13 (59) ...................... SEG 17 ( 9)
SEG 2 (70) ........................ SEG 6 (20)
SEG 12 (60) ..................... SEG 16 (10)
SEG 1 (71) ........................ SEG 5 (21)
SEG 11 (61) ..................... SEG 15 (11)
SEG 0 (72) ........................ SEG 4 (22)
73/74 VCC/VREF
IN
Connected to GND.
75
AVSS
IN
Connected to VC.
76
COM3
OUT
Terminal not used.
77
COM2
OUT
Common data signal:
Connected to LCD signal COM1.
Connected to LCD signal COM1.
78
COM1
OUT
Common data signal:
Connected to LCD signal COM2.
Connected to LCD signal COM2.
79
COM0
OUT
Common data signal:
Connected to LCD signal COM3.
Connected to LCD signal COM3.
80
VL3
IN
Power source voltage input terminal.
Standard voltage for LCD.
Standard voltage for LCD.
Pin No.
Signal
I/O
Description
R-555(SL)
16
1. Precautions fAor Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI
have extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
charge in clothes, etc., and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI
have extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
charge in clothes, etc., and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap
them in aluminium foil. Also wrap PW boards
containing them in aluminium foil.
containing them in aluminium foil.
2) When soldering, ground the technician as shown in
the figure and use grounded soldering iron and
work table.
work table.
2. Shapes of Electronic Components
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so.
To perform the servicing, power to the touch control
panel is available either from the power line of the oven
itself or from an external power source.
touch control panel of the microwave oven and the
precautions you must take when doing so.
To perform the servicing, power to the touch control
panel is available either from the power line of the oven
itself or from an external power source.
(1) Servicing the touch control panel with power
supply of the oven :
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD .
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD .
Therefore, when checking the performance of the
touch control panel, put the outer cabinet on the
oven to avoid touching the high voltage transformer,
or unplug the primary terminal (connector) of the
high voltage transformer to turn it off; the end of
such connector must be insulated with an insulating
tape. After servicing, be sure to replace the leads to
their original locations.
touch control panel, put the outer cabinet on the
oven to avoid touching the high voltage transformer,
or unplug the primary terminal (connector) of the
high voltage transformer to turn it off; the end of
such connector must be insulated with an insulating
tape. After servicing, be sure to replace the leads to
their original locations.
A. On some models, the power supply cord between
the touch control panel and the oven itself is so
short that the two can't be separated.
short that the two can't be separated.
For those models, check and repair all the
controls (sensor-related ones included) of the
touch control panel while keeping it connected
to the oven.
controls (sensor-related ones included) of the
touch control panel while keeping it connected
to the oven.
B. On some models, the power supply cord between
the touch control panel and the oven proper is so
long enough that they may be separated from
each other. For those models, therefore, it is
long enough that they may be separated from
each other. For those models, therefore, it is
approx. 1M ohm
SERVICING
possible to check and repair the controls of the
touch control panel while keeping it apart from
the oven proper; in this case you must short both
ends of the door sensing switch (on PWB) of the
touch control panel with a jumper, which brings
about an operational state that is equivalent to
the oven door being closed. As for the sensor-
related controls of the touch control panel,
checking them is possible if the dummy
resistor(s) with resistance equal to that of the
controls are used.
touch control panel while keeping it apart from
the oven proper; in this case you must short both
ends of the door sensing switch (on PWB) of the
touch control panel with a jumper, which brings
about an operational state that is equivalent to
the oven door being closed. As for the sensor-
related controls of the touch control panel,
checking them is possible if the dummy
resistor(s) with resistance equal to that of the
controls are used.
(2) Servicing the touch control panel with power
supply from an external power source:
Disconnect the touch control panel completely from
the oven proper, and short both ends of the door
sensing switch (on PWB) of the touch control panel,
which brings about an operational state that is
equivalent to the oven door being closed. Connect
an external power source to the power input terminal
of the touch control panel, then it is possible to
check and repair the controls of the touch control
panel; it is also possible to check the sensor-related
controls of the touch control panel by using the
dummy resistor(s).
Disconnect the touch control panel completely from
the oven proper, and short both ends of the door
sensing switch (on PWB) of the touch control panel,
which brings about an operational state that is
equivalent to the oven door being closed. Connect
an external power source to the power input terminal
of the touch control panel, then it is possible to
check and repair the controls of the touch control
panel; it is also possible to check the sensor-related
controls of the touch control panel by using the
dummy resistor(s).
4. Servicing Tools
Tools required to service the touch control panel
assembly.
1) Soldering iron: 30W
assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC -
10MHz type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control
unit, remove the aluminium foil applied for preventing
static electricity.
static electricity.
2) Connect the connector of the key unit to the control
unit being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that
abnormal voltage due to static electricity etc. is not
applied to the input or output terminals.
applied to the input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to
PWB, making sure that all connections are tight.
5) Be sure to use specified components where high
precision is required.
Transistor
2SB1238
2SB1238
E
C
B
R-555(SL)
17
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Disconnect oven from power supply.
2. Visually check the door and cavity face plate for damage
2. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any
of the following removal procedures:
of the following removal procedures:
WARNING FOR WIRING
To prevent an electric shock, take the following
manners.
1. Before wiring,
manners.
1. Before wiring,
1) Disconnect the power supply.
2) Open the door and wedge the door open.
3) Discharge the high voltage capacitor and wait for
2) Open the door and wedge the door open.
3) Discharge the high voltage capacitor and wait for
60 seconds.
2. Don't let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, High voltage transformer, High
voltage capacitor, High voltage rectifier assembly
and High voltage fuse.
voltage capacitor, High voltage rectifier assembly
and High voltage fuse.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
and Oven cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector certainly until its
4. Insert the positive lock connector certainly until its
pin is locked. And make sure that the wire leads
should not come off even if the wire leads is pulled.
should not come off even if the wire leads is pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Re-install
1. Rest transformer on the bottom plate with its primary
1. Rest transformer on the bottom plate with its primary
terminals toward the oven face plate.
2. Secure transformer with four screws to bottom plate.
3. Re-connect wire leads (primary and high voltage) to
3. Re-connect wire leads (primary and high voltage) to
high voltage transformer and filament leads of
transformer to magnetron and high voltage capacitor.
Refer to "PICTORIAL DIAGRAM".
transformer to magnetron and high voltage capacitor.
Refer to "PICTORIAL DIAGRAM".
4. Re-install outer case and check that oven is operating
properly.
OUTER CASE REMOVAL
To remove the components, procedure as follows.
1. Disconnect oven from power supply.
2. Open the oven door and wedge it open.
3. Remove four(4) screws from rear and one (1) screw
1. Disconnect oven from power supply.
2. Open the oven door and wedge it open.
3. Remove four(4) screws from rear and one (1) screw
along the right side edge of case.
4. Slide the entire case back out about 1 inch(3 cm) to free
it from retaining clips on the cavity face plate.
5. Lift entire case from the unit.
Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads (primary and high voltage) from
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads (primary and high voltage) from
high voltage transformer.
3. Disconnect filament leads from the magnetron and the
high voltage capacitor.
4. Remove four (4) screws holding transformer to bottom
plate.
5. Remove transformer from bottom plate.
HIGH VOLTAGE TRANSFORMER REMOVAL
6. Discharge the H.V. capacitor before carrying out any
further work.
7. Do not operate the oven with the outer case removed.
N.B.; Step 1, 2 and 6 form the basis of the 3D checks.
CAUTION: DISCONNECT OVEN FROM POWER SUP-
N.B.; Step 1, 2 and 6 form the basis of the 3D checks.
CAUTION: DISCONNECT OVEN FROM POWER SUP-
PLY BEFORE REMOVING OUTER CASE.
DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPO-
NENT OR WIRING.
DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPO-
NENT OR WIRING.
R-555(SL)
18
1. CARRY OUT 3D CHECKS.
2. Disconnect the brown and blue wires of power supply
2. Disconnect the brown and blue wires of power supply
cord from the noise filter.
3. Disconnect the wire leads of the main wire harness
from the noise filter.
4. Disconnect the high voltage fuse from the high voltage
transformer.
5. Disconnect filament lead of the high voltage transformer
from the high voltage capacitor.
6. Disconnect high voltage wire of the high voltage rectifier
assembly from the magnetron.
7. Remove one (1) screw holding capacitor holder to the
oven cavity rear plate.
8. Remove one (1) screw holding high voltage rectifier
assembly to capacitor holder.
9. Disconnect rectifier terminal from capacitor.
Now, the high voltage rectifier assembly is free.
10.Disconnect high voltage fuse from capacitor.
Now, the high voltage fuse is free.
11.Remove the high voltage capacitor from the capacitor
holder. Now, the high voltage capacitor is free.
CAUTION: WHEN REPLACING HIGH VOLTAGE
RECTIFIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH VOLTAGE
RECTIFIER MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW.
GROUND SIDE TERMINAL OF THE HIGH VOLTAGE
RECTIFIER MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW.
MAGNETRON REMOVAL
Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from magnetron.
3. Remove the four (4) screws holding chassis support to
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from magnetron.
3. Remove the four (4) screws holding chassis support to
oven cavity front plate, oven cavity rear plate, magnetron
and fan duct.
and fan duct.
4. Remove the chassis support from oven.
5. Carefully remove the four (4) screws holding magnetron
5. Carefully remove the four (4) screws holding magnetron
to waveguide flange.
6. Lift up magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
7. Now, the magnetron is free.
Re-install
1. Re-install the magnetron to waveguide flange with the
1. Re-install the magnetron to waveguide flange with the
four (4) screws.
2. Insert the two (2) tabs of the chassis support to the oven
cavity front plate and back plate.
3. Re-install the chassis support to oven cavity front
plate, oven cavity rear plate, magnetron and fan duct
with the four (4) screws.
with the four (4) screws.
4. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM".
5. Re-install outer case and check that the oven is
operating properly.
CAUTION: WHEN REPLACING MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
MOUNTING SCREWS ARE TIGHTENED
SECURELY.
MOUNTING SCREWS ARE TIGHTENED
SECURELY.
1. CARRY OUT 3D CHECKS.
2. Pushing the lever of positive lock
2. Pushing the lever of positive lock
®
connector.
3. Pull out the positive lock
®
connector.
CAUTION: WHEN YOU (SERVICE ENGINEERS) CON-
NECT THE POSITIVE LOCK
®
CONNECTORS
TO THE TERMINALS, CONNECT THE POSI-
TIVE LOCK
TIVE LOCK
®
SO THAT THE LEVER FACE
YOU (SERVICE ENGINEERS).
POSITIVE LOCK
®
CONNECTOR REMOVAL
Figure C-1. Positive lock
®
connector
1. Open covers of the terminal insulator by using small flat
type screw driver.
2. Remove the receptacle from the terminal insulator.
3. Now, the terminal insulator is free.
3. Now, the terminal insulator is free.
Installation
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown
illustlated below.
TERMINAL INSULATOR REPLACEMENT
CONTROL PANEL ASSEMBLY REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from panel components.
2. Disconnect the wire leads from panel components.
3. Remove the one (1) screw holding the control panel
assembly to the oven flange.
Terminal
Push
Pull down
1
2
Lever
Positive lock®
connector
Terminal
insulator
insulator
Flat type
screw driver
screw driver
Receptacle
Covers
HIGH VOLTAGE RECTIFIER, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR REMOVAL
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